| Castex | |
| Commune Status: | Commune |
| Arrondissement: | Mirande |
| Canton: | Mirande-Astarac |
| Insee: | 32086 |
| Postal Code: | 32170 |
| Mayor: | Robert Sassoli[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 43.3764°N 0.3114°W |
| Elevation M: | 242 |
| Elevation Min M: | 217 |
| Elevation Max M: | 323 |
| Area Km2: | 5.38 |
Castex is a commune in the Gers department in southwestern France.